I don't eat meat on Good Friday, and never have growing up.
I agree that the real meaning behind why meat was given up on Good Friday and has been lost and replaced with gorge yourself on seafood, and some what encouraging the overfishing of the oceans (just like Christmas).
I'm not fussed as to how people celebrate their holidays though, eat meat or not.
At the restaurant dh is running a seafood degustation, it's booked out. However mil is disgusted that we appear to be celebrating the day by making money, but that's her problem not ours.
My children will eat fish for dinner, I shall have something minimal (mainly because I will be working) and dh will eat whatever he can get his hands on.